You're right to be cautious and to research this. It's important to get this right for safety. Here's a breakdown of how to properly bond CSST gas piping

Understanding the Issue: Why Bonding/Grounding CSST is Crucial

CSST (Corrugated Stainless Steel Tubing) is more susceptible to damage from electrical arcing than traditional rigid gas pipe. Electrical arcing can occur during lightning strikes or from nearby electrical faults. This arcing can puncture the thin walls of the CSST, leading to gas leaks and potential explosions. Bonding creates a low-resistance path for electrical current to travel, minimizing the risk of arcing.

Key Points and Best Practices1. Never Clamp Directly to CSST



This is a critical point. You never clamp a grounding/bonding connector directly to the CSST itself. This can damage the tubing and compromise its integrity. Your initial thought was correct.2. Bond to the Solid Metal Piping

As you mentioned, you bond to a section of rigid metal gas piping (black iron or steel) upstream of the CSST connection. The idea is to provide a path for electrical current to bypass the CSST altogether. "Upstream" is as close to the source of the gas (gas meter) as possible As close as possible reduces the likelyhood of arcing over the CSST during electrical event Some codes will allow grounding to the electrical service panel if you are not able to ground to the solid metal pipe3.

Approved Bonding Connector

Use a bonding connector specifically listed and labeled for grounding metal pipes. These are readily available at electrical supply stores and home improvement stores. A water pipe grounding clamp is usually suitable.4.

Size of Bonding Jumper

The size of the bonding jumper wire should be based on the size of the circuit that could energize the gas piping system. Consult your local electrical code or a qualified electrician for the correct size. The typical size is #6 AWG copper wire.5.

Where to Connect the Grounding Wire



To the Electrical Service Grounding System

The grounding wire runs from the bonding connector on the rigid gas pipe directly back to the main electrical service panel's grounding bus bar or to the grounding electrode conductor (the wire that connects the panel to the ground rod or water pipe ground).* The goal is to create an electrical bond between the gas piping system and the electrical grounding system, so any electrical current can safely flow back to ground.

The Inspector's Statement

The inspector's statement about clamping to the CSST is incorrect and potentially dangerous. It's important to correct this misunderstanding for the safety of the occupants.

Recommended Actions


Consult a Qualified Electrician

The best and safest course of action is to hire a licensed and experienced electrician to perform the CSST bonding. They will be familiar with local codes and best practices.2.

Show the Inspector

If you want to challenge the inspector, research the CSST manufacturer's installation instructions and show them the documentation that states you cannot clamp directly to the CSST. The inspector may have been confused.3.

Check Local Codes

Verify the specific bonding requirements in your local electrical code. Codes can vary from one jurisdiction to another.

Important Safety Note

If you suspect a gas leak, leave the area immediately and call your gas company or 911 from a safe location.

In summary, DO NOT clamp the bonding connector directly to the CSST. Bond to the upstream rigid metal gas pipe using an approved connector and run the grounding wire back to the electrical service panel's grounding system. Flag for review